Each week, New York Times crossword puzzle editor and NPR's Puzzlemaster Will Shortz presents an on-air quiz to one contestant and gives a challenge for listeners at home.

The American Sphinx was a compendium of puzzles and riddles published in New York in 1875. Containing over 150 “enigmas, anagrams, charades” and a great many more word and number games (as outlined in ...

Think you are a bit of a genius problem solver? Then have a go at our challenging riddles and tricky brain teasers. You may already think you're a know-it-all when it comes to quizzes but this is a ...

Math Riddles fulfil several purposes in one go. They help improve your mathematical skills, calculation, and ability to deduce answers. It is perfect for anyone who enjoys playing around with numbers ...

We shall identify the LHS as (AB) + (CD) and RHS as (A + B) + (C + D) ...

George L. Carlson was an American illustrator and author, best known for his work as a newspaper cartoonist (and for producing the dust jacket for one of the best-selling novels of all time, Gone with ...